Index: kernel/generic/src/synch/smc.c
===================================================================
--- kernel/generic/src/synch/smc.c	(revision edebc15c65ded52ed661523a687334ecc04a7578)
+++ kernel/generic/src/synch/smc.c	(revision edebc15c65ded52ed661523a687334ecc04a7578)
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2008 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup sync
+ * @{
+ */
+
+/**
+ * @file
+ * @brief	Self-modifying code barriers.
+ */
+
+#include <arch.h>
+#include <macros.h>
+#include <errno.h>
+#include <arch/barrier.h>
+#include <synch/smc.h>
+
+unative_t sys_smc_coherence(uintptr_t va, size_t size)
+{
+	if (overlaps(va, size, NULL, PAGE_SIZE))
+		return EINVAL;
+
+	if (!KERNEL_ADDRESS_SPACE_SHADOWED) {
+		if (overlaps(va, size, KERNEL_ADDRESS_SPACE_START,
+		    KERNEL_ADDRESS_SPACE_END - KERNEL_ADDRESS_SPACE_START))
+			return EINVAL;
+	}
+
+	smc_coherence_block((void *) va, size);
+	return 0;
+}
+
+/** @}
+ */